Process of electrically welding tubes.



JJSAEK.

I PROCESS OFELECTRICALLY WELDING TUBES. I APPLICATION FILED DEC- 13.1916- 1,213,422. Patented Jan. 23, 1917.

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a m1 TED STATES P TENT omen,

oHANN SACEK,- or cHARLorrnNnURcaeERMANY, assrenon'gio our. nnnmrcnFISCHER, OF CHABLOTTEIYBURG,

of which the following is a full,' clear,- and exact specification.

- Reference is to be had to the accompan ing drawing in which I haveshown a constructional example of an apparatus which may be used inconnection with my improved process.v

' Flgure 1 1s a longitudinal section'and Fig.-

2 across section of the apparatus. Fig. 3 is.

a diagrammatic cross section of the finished product. 1

"A roller a and a mandrel c,preferably of copper, form thetwo poles ofthe welding 1 circuit s. The roller a may be of copper or any other goodelectric conductor. The mandrel a may be tubular. .It has an extension2' provided with a groove is. With the exception of extension .5, themandrel is providled with a coating e of insulating matena v 'Ijhe tlibeto beiwelded is slotted at Z.

Strips f-and it formed of the same material as the tube, are placed onthe upper and under side of the tube along its slotted portion.Thesestrips do not strengthen the welding seam, but only serve forconcentratin the welding heat along the seam t en the current passesthrough roller a and mandrel a, the strips f and It are weldy a ISpecification qLLetters Patent.

NEAR BERLIN GERMANY.

rnoc'nss or ELECTBICALLY WELDING TUBES.

PatentedJan. 2 3, 1917.

Application filed December 13, i916. Serial No. 136,786. I

ed with the tube 9 along the slot Z and form a very reliable seam, Thestrips during the welding are compressed homogeneously with the body ofthe tube, as shown at a: (Fig. 3), with a resultant slight increase ofthick- 40 ness at=the s e'am, such thickness depending, however, uponthe degree of pressure he tween the'r oll and mandrel.

What I claim is:

1. process of electrically welding tubes \consisting in placing a planestrip of the same material as that of the tube along the".

, welding seam on the outside of said tube,

said strip overlapping the seam, and passing an electric current throughsaid strip.

2. A process of electrically welding tubes consisting in placing a"separate plane strip the same material as that of the tube along thewelding seam on the inside of said tube, said 'strip overlapping theseam,'55

nd passing an electric current through said strip.

3. A process of electrically welding tubes consisting in placing stripsof the same ma? terial as that of the tube along the welding seam insideand outside of said tube, said strip overlapping the seam and assing anelectric current through said stri ps.

In testimony, that I claim the foregoing as my invention, ,1 have signedmy name in 5 presence of two subscribing witnesses.

I J OHANN SACEK. Witnesses:

HENRY Hasrmg, v

E; .izNN Nos.

